Rollup merge of #105068 - jneem:master, r=jyn514

Run patchelf also on rust-analyzer-proc-macro-srv.

On NixOS, `rust-analyzer-proc-macro-srv` needs to be `patchelf`ed just like all the other libs and binaries.

With this fix, I am able to use the language server configuration recommended in [the guide](https://rustc-dev-guide.rust-lang.org/building/suggested.html#configuring-rust-analyzer-for-rustc).

src/bootstrap/bootstrap.py

@@ -441,6 +441,7 @@ def download_toolchain(self):
 
             self.fix_bin_or_dylib("{}/bin/rustc".format(bin_root))
             self.fix_bin_or_dylib("{}/bin/rustdoc".format(bin_root))
+            self.fix_bin_or_dylib("{}/libexec/rust-analyzer-proc-macro-srv".format(bin_root))
             lib_dir = "{}/lib".format(bin_root)
             for lib in os.listdir(lib_dir):
                 if lib.endswith(".so"):

src/bootstrap/download.rs

@@ -360,6 +360,7 @@ impl Config {
 
             self.fix_bin_or_dylib(&bin_root.join("bin").join("rustc"));
             self.fix_bin_or_dylib(&bin_root.join("bin").join("rustdoc"));
+            self.fix_bin_or_dylib(&bin_root.join("libexec").join("rust-analyzer-proc-macro-srv"));
             let lib_dir = bin_root.join("lib");
             for lib in t!(fs::read_dir(&lib_dir), lib_dir.display().to_string()) {
                 let lib = t!(lib);